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علوم تجربی حرارتی و سیالات 2011
جزئیات رویداد
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  • evaporation and flow dynamics of thin, shear-driven liquid films in microgap channels

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1016
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     thin and ultra-thin shear-driven liquid films in a narrow channel are a promising candidate for the thermal management of advanced semiconductor devices in earth and space applications. such flows experience complex, and as yet poorly understood, two-phase flow phenomena requiring significant advances in fundamental research before they could be broadly applied. this paper focuses on the results obtained in experiments with locally heated shear-driven liquid films in a flat mini-channel. a detailed map of the flow sub-regimes in a shear-driven liquid film flow of water and fc-72 have been obtained for a 2 mm channel operating at room temperature. while the water film can be smooth under certain liquid/gas flow rates, the surface of an intensively evaporating film of fc-72 is always distorted by a pattern of waves and structures. it was found, that when heated the shear-driven liquid films are less likely to rupture than gravity-driven liquid films. for shear-driven water films the critical heat flux was found of up to 10 times higher than that for a falling film, which makes shear-driven films (annular or stratified twophase flows) more suitable for cooling applications than falling liquid films.

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